HELP, HELP 94726, 94729, ect......

I need to know what codes to use when billing a complete PFT. I work for a 6 pulmonologis practice and We do lung volume, diffusion, and spirometry. But I have been asked by multiple insurance's to provide medical records, and deny they claim until this information is provided. Maybe I am doing something wrong? WHat is the correct way to bill a complete PFT? PLease help.

re: HELP, HELP 94726, 94729, ect......

94010 Spirometry, 2012 work RVU = 0.17 New Instructions: measures expiratory airflow and volumes and forms the basis of most pulmonary function testing.
“When spirometry is performed before and after administration of a bronchodilator, report 94060.”
• Measurement of vital capacity (94150) is a component of spirometry and is only reported when performed alone.
• The flow-volume loop (94375) is used to identify patterns of inspiratory and/or expiratory obstruction in central or peripheral airways
• Spirometry (94010, 94060) includes maximal breathing capacity (94200) and flow volume loop (94375), when performed.